Shelf



FIG. 1 is a perspective view of a shelf showing our new design.

FIG. 2 is a front plan view thereof;

FIG. 3 is a right plan view thereof;

FIG. 4 is a left plan view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear plan view thereof.

The wavy broken lines in the drawings are broken away to disclose indeterminate length. 

CLAIM The ornamental design for a shelf, as shown and described. 